NMR Probe coil form structure

Abstract

An RF probe for a gyromagnetic resonance spectrometer includes a coil cage for supporting the probe coil preferably within the cage formed of a number of rod-like members displaced parallel to the coil axis and spaced apart from the axis at a constant distance. Access to the coil through an axial continuous slot 46 or equivalent eliminates axial discontinuity in susceptibility due to discrete holes in the coil form.

What is claimed is: 
     
       1. An RF probe for a spun sample gyromagnetic spectrometer comprising: (a) sample containment means for holding a sample for analysis,   (b) sample spinning means for rapidly rotating said sample containment means about a rotation axis,   (c) RF saddle coil means surrounding said sample containment means for exciting and detecting gyromagnetic resonance in said sample,   (d) RF coil support means for supporting said RF coil in axial alignment with said rotation axis and spaced from said axis, said support means having at least one axially aligned slot in the lateral wall thereof, the axial length of said slot extending along substantially the axial length of said RF saddle coil means.   
     
     
       2. The RF probe of claim 1 wherein said coil is disposed within the interior of said coil support means. 
     
     
       3. The RF probe of claim 2 wherein said RF coil support means comprises an axially symmetric assembly of rigid axial support members disposed in the plane transverse to the symmetry axis, each member parallel to said axis and plate members for securing the ends of said axial members, whereby an open structure is formed for supporting said RF coil. 
     
     
       4. An RF probe for a spun sample gyromagnetic spectrometer comprising an RF coil surrounding a sample region and an axially symmetric assembly of rigid axial support members disposed on the circumference of a circle in the plane transverse to the symmetry axis of said coil, each member parallel to and displaced from said axis by constant distance, and planar members forming the ends of said support structure, whereby open structure is formed for support of said RF coil. 
     
     
       5. The RF coil support structure of claim 4, said rigid axial support members adapted to receive respective compensating members in proximity to the end regions of said axial support members, said compensating members selected to extend the average magnetic susceptibility of said coil region into said end regions.